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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ae65c4d0b7ebf667af1fd5c9b53ba5be94533faf619dae7c2a9536a6029fdc0' 
  AND token = 'ehRq+9LQSTdfiZLox9Yv5Lfm0yZVJ5c7VVNqek4U4fU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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