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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b46303fdc4db42a35959e6f0c42248be0984acb02e37df5d600744c558e3c69f' 
  AND token = 'fCPrk7lzmF622qSeAsoDtlq4iuM5pDKGQtY8GrTc+SU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}