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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1ddfe705c45d99b2f43792b92ecac67e7329da125b35d1c2fe325673757559d' 
  AND token = 'y6VExG1SG5/lA7PZfJFpUxQY4OdS0rpgGxPl21Jzuts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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