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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01e4dffd5de6236dbd5ae1e647c9ac731142e33bd92e47537251a46dc879d2be' 
  AND token = 'h2Fpzz5M174S5oW6nPy2tjmIEfD4q/ojH9t3RE1IW84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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