SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cd024bb911370e401f52a471870b7e25b7f0e636e8c26f1ac8f06098c48566c' 
  AND token = 'BBQ3aFIyvoYLfsHVJUFUzqGTx9Dp4SDQXhk1tw3Fudc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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