SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '683c150a05c9ff8be3ab28cf128ca7299f035e1f3715373ac3367df8995978ab' 
  AND token = 'o2uf8nS+VYQ6mEBCiU4R1i3jhFwVr71KzJZYo6zvuyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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