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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f2403faf19ba765e6ce66a748d8f7963ef72fc809734bf3ce9f75de8d95ffc2' 
  AND token = 'tYF7TwBt/FsPqBHYT+ikWfcsP1FP9TlGzCe0KKbxKy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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