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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd829a2ace0bd20073735bcad3c9d24dbc1024accc3909d3ff07c3d15af4b7aec' 
  AND token = 'c7NhkNKvW/htbEguvOqwmEj4D6NlfNZYwAu/GNTkjYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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