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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a69ce623655abe126e88aff8b044c3a538d157abf23f10c7b366bced20c4249e' 
  AND token = 'y/ndMa6ojoZKOHcmsPwqtblp5pBnpBEn+JSdan+cMMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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