SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b7494b03798581a4a0f9c7167b9545dd0c71e5b92a186e13748b9f0cc5a0176' 
  AND token = '+swuuJQJ8tJsOdeH8Ib/wn5GBpKZv3+SuzPjHcX1BEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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