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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a19e95f220f4bb457de6a4dff8deaa5511251aae0b72d5f1acbc024c5cdc9e7' 
  AND token = 'hwCSm4Wgk7w1WodFAbAkVuIuxt+pDlOtiCXKwJf/d5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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