SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd83ec8313e0b36defef09ac4405a3917cc00483271f1599db2a4a8f9706c9d7' 
  AND token = 'W+yrFmjMgK6gfQhgpRXDZ4QQ6fELPMzYZUdxNJalJcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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