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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a31f3e320e2cf4b31011176c1e24e54bcc68c7de4bf427c93de6a835d22b8d4' 
  AND token = 'rEoz0udhs52ns7eF5dMSFgTsoue6jFb5Z0J5JbDwLCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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