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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fff9ca845761e4f042049c305ddaaa0de56551fe0da6cb5ccffb9141c6db5b5' 
  AND token = 'xtVWS1UlMeSwY/BSgr6d2a0vBoO1ppgQcNsGU6TXYtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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