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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c86a4d879a1aec1cbf7f337c669710b3f2c10a4977ba292cd1f63eea9b8a7be2' 
  AND token = 'f0q27ff+xnq3ptB1ZbFBZQHZl5AQr40Se1c2hQh8Ikw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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