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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a54d54a33c7932bc511d89f8a2626f5d07ff835062efabe3f7cce3b7096ba1d7' 
  AND token = 'tXLgj4PmI5j6qf4ZasQFdGErFib8HblZZ/zDtbvF5Ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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