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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56f6eba418e6f28ee7a2bf919c3b974d8d7d9f2496b2160a287bff81c7eee3cc' 
  AND token = 'XKcydWPMZVy1ZAYJbITOfcAyck2F+AcLZWZccPa+1kU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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