Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52837dc7bd009d173817354df518e730cbd066062d4cd40d5c8e350015574f45' 
  AND token = 'qnvHm2fCbBWEvJjJLN3NpbXUW75XOEXguqWlieEwp8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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