SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6abeb5f879697074cc8ad2ff04f85d376f7abf00658c4b7c093a893fa90e787b' 
  AND token = 'ww+8iijNjRHsRKvDTzgdYtI5zYofxFnoAxPJCd++qzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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