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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a870454031f2241c7cc5e55e655406b30fa57aa8e44b7e6c989c79a243bae33' 
  AND token = 'uxigBC4+fxE7tO+x55g/9pQ5zx5XFzniXXsnPzZV/hQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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