SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e41b4f4c37c7c68d4619326e5ca8be16a8cea7ba62027312f092f21240fdb7b9' 
  AND token = 'lQ5zSfVJn2TQriIDfIWzWRYBwYVfw2TvhMWYU0fgKRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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