Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c54b980948a1d371029071ec7d3bb5c7a51662362e43f6e927772d60d2a87553' 
  AND token = 'lxBGUEtkckEmZMk52tvrtv+1kj0nEL7+Gm/OqOXNtJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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