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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa69b44e97f1ae75d8a8f86a7d549b418d6008e56d2adb15de61567abef6cf09' 
  AND token = '3GbeuySGkg9SKjGZEpmQeV4SHWNMczPeuse9gpwek4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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