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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a9bd5503df63baa119da7818521ee778bd86e17e0ef11d97aed3a895f0bcc26' 
  AND token = 'KFAi0DbOa+SCpp3427TeZEYdon57TLXJFxe5QvC0kWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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