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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fa19a93f1a27656f92d444a8af5ee18efa07b014443e826fa45503fa7140ddb' 
  AND token = 'Yp6Nnst3bWoLOZ/m/+a3k5XWHrRw1OWXFnPDzgATxe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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