SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33aaf9c1691694f9ff06f68ff4e1cf117b557ff1c021842a6a0e9e0a93792e07' 
  AND token = 'vtKGt8dX9UPnjHBNM56jnYz5U+uHBCpA6yGvwdoFhYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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