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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff976c1141527705fbf7e83d6ac13bc40110494b9e58a53569003967655e68b3' 
  AND token = 'eNC1gi4OGBsNDhmZ//y3STf0QDUN6Ohw2+qBjcPdTfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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