SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4985dc1aa365703dafb63139ac8ddf16b4238daf5a7f9ef4cfb98b2da5637b4' 
  AND token = 'PzqAPBbByR8yVynVK/Q/IhUS2OXdJya5jZVW6eKpUuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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