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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15564c162d1ae3efeced7b5a0af8fbd492eef58e4df2db592e6a39b65daf83b2' 
  AND token = '7kWyqIJNmnDwIoKhU2IqhJPnUFXVhR5/Vrx8HsxJ96g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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