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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e77aea25a7ee881689725a7633a554f664aab4903e3e08901c62afe850410a71' 
  AND token = 'QiztKUMMdiI93lewVlJt6O1f5ZM6t4aBKfU0UkuDueI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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