SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86f9511e052b49f57bf321f64b060b6ec099ef31d573c07aeee9611386f19e48' 
  AND token = 'gPANjGKfAzZFxYswhY8ydaQXGnZQ4ein8LSFu4BYbYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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