Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b026bc27fa647de73a0aa92d26133d8fdbe0db2007d9e0bae38f9e7639f38035' 
  AND token = 'Zv9HlF1P+RhhJVci5WmbSNklUcSmgV7XvrrAtv1dqYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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