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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79efea935ed1340362f42fce02d7cda579304e88b905cabda97a9db6c1f9293f' 
  AND token = 'TUCOKntXkQCMsUUOjCJEn6nabXTxZhFLDpak/TL5d+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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