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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc37269986b579c80c17e8274c87ff08b1fb17b98abd99c7fca14f0ef36a85db' 
  AND token = 'WxEAohnKozq8UyxmzJqQ5wfp+LIdo2LQ+1JnPu3QUzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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