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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d2c711aeebe5eede267f68303162c9d802210f7333d65d16b26eaeaeaa193f6' 
  AND token = '3CY+bgOEPQcd49Iu3od9Hg/4sv6rW66F7FC+UXxPoWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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