SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '423bc79406d17e029d6daa56b61dd5f9896ac0700bc18ec98d74802cfd6ed2d5' 
  AND token = 'asDsC+YNYHvyWKgTWj+Ufv9cI3H4PVNG9e/tzJHcNpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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