SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f69580a53e88cddc4a3447bd52e044d169213e9077f64a91f6a6e741ab9c1c5b' 
  AND token = 'QAhYZ8qXL+RKxZwtkGWTiUBQRF7yLqg0r0wY7t6FkZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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