SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5862586715055283f3dfda3d0eb108a41088035423b63e91b30ff59f2cbc08f9' 
  AND token = 'hZuO1CYwdexP/CN+FnuMzd5adoKjDqUfZkFH2+pqLKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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