SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0941507aa3b268be77ac6fd98db4b6c37c56aa5fd9662b15f6ec403e5a232c8' 
  AND token = 'QzzCVfwnzc+mhnc4ozxCgbFmu3YfJdJo96T4uqWSuZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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