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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef945984f79974959afae750c16980ef1c922e6c137471ed234081c21f30f63e' 
  AND token = 'cKP50DXbP9D8wJYoKxxOp22MrclMGzPCvFUgx12BXU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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