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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '218701a0799ca5605c78799cecc10d57fb2afa2d1ed6b5c1ce727a450df7128e' 
  AND token = '9QcF0YuONfDuTN1iFSE1miyV/MT9WETY1uvLUgg4FV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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