Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecdf5cfaa6694180f0d71119437520e9e5040429ab2a766cdb072d0d0e8c438b' 
  AND token = 'zsd/TjcK3uEZc3OKVFf2q8g6eQ7NoqGvDAhxXiQ9Nso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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