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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfe53f147ffa3a8bb7fd616854fd0956be97be3207bfe3c9cc48a719f83d9501' 
  AND token = 'Sa3bbsLz7khvE7aXl5MMJ5mqm4Phc7a0+cFwW+6O+e8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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