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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fc1ac6c343854c33f226c88bb9e70652b7e3413ab0005714e6158f432effa59' 
  AND token = 'njYP9t8ySyE3Pn3hbiHqzy+ICigNTWWt9Lf6c98WsyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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