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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de4e3de0a815fd5b658d3da67ed3b564c34ac92f322843c5ea638e92af7accf4' 
  AND token = 'WFq7bAJH+g/EhIzAzd7cKKnD/tYKaviT70vP/ogR+DA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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