SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb6f77a42df5078398f1969252faa68e53b15944c3906301bd8c87705d0bdbe1' 
  AND token = 'mdP/MoKzqzdh3MPvTcyuwAPaxf9U6BWk8gKgJdqBn/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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