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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce6570ade291ff9433c7d37e6f04cef0c3f7b4c6dca6bd4ba95d25ff6a89e999' 
  AND token = 'RF4NkVRqR6RfZWra02apL92+N6k4Qok7C8vzURCuys0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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