SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '012087392cb5c08af5432d2864ea207d6b8dce8241ecc6249f9a97c24ba34ad2' 
  AND token = 'vL1jVAHJ5NYqT+HPZ9chEqujRzErcteD4KowFzljVq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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