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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ce3678d57e2f7a971fccffa0f351c832194741e4c319cce2462728cab0f79b7' 
  AND token = 'kJXBmDo0vcHUV5uyrKM+JhN3bTWxPOEAtWKqNO0RpLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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