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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '270c8ff106c584bb7ef087773ec9b4d08df5333ccc0840a88a918bca6f932321' 
  AND token = 'YExto4xDf5n8XnQ3VnlBkklLQ4d/iGH8Tz7o0iDl4vM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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