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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bbd09d2542502adba16d399ce0681a692eb1e92ac5383f4e1a1d6cc0fae2b7c' 
  AND token = 'NJNMar37mbZNk/NsU6xfamNQfUkgA+749iBuJ4f6TZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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