SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15b5b0031d5980488302271fda3687d1a86f04cc669c87e7999420579b787511' 
  AND token = 'WB5IpTBr41jJw/WqFrESPqUGKjoFKjhSL0jHR/YwmCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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