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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5719b7956d883fabdfc9b4378b40030006f7659d416f6d9f5a43f2002767ab89' 
  AND token = '0C1T8exw59Wu0nR9zMS9g2trrsTYDb64qww6zrEWCM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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