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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '838b027918bd2bb3e7015a8f122e7c9c49a90749d7e5b155c5942ed23498df8d' 
  AND token = '4mecVICs+UHiM2wUquWt4AMhT1XaVtkVwsC8E5XFkwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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