SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41f5e17592b7d851bf1912d66e4c26abd5acc145376ce46e1f8e4d960188c8bc' 
  AND token = 'UuUCd7S7YZp9OxXCv5dHSrUZ2JUJAGKKXrqj+gjTISI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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