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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cbe046df0baa82c1ec8123560e82b7e2ab6b7315803f95f26cd72a0ed74d814' 
  AND token = 'zOG730fbwdLgO4QfvBiYhK9Usbb2lC4xK0YMUOsv1fU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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