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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ff67ea05f1161368ebb1a2013bf402865280b6bebc6763591ec527d5d8fc2a1' 
  AND token = '1jGPeQsOTsBQyBj4Yj24KuWih98AK+jchzbujT6fcf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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