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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9477561badf09b4c3be3de1d86d0081055124b5bc260623239b93f8585c28d8a' 
  AND token = '4hQmPfROMT6/coermtH0UIWu6wq50EqzpXhS/ehAgjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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