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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae714f90e2c3038f677483adb27b413003369e3ae90e87559084ad69c3ea9e68' 
  AND token = 'WxVIWlKlPhAxYWCPzzyH8ccQIRYC/5/ydsrfNFdPEq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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