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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc6acb9cf124ff9b0d97d429ff9d20da9e8171c375e862d76f503f721e2b5696' 
  AND token = 'NswQrhvMhy3kXj09f3VjlGsnSX0cJI2vHzmtZc1iAvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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