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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87713ac5fe5332ee15d6dbe684a418ded089a93a7dfc48c2c4666f0ebceb0eed' 
  AND token = 'GuBbq/t6lfPnFn2X+aChFmbthEE65x0hV/QccyL3huE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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