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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1068b4121cf5f386a2bb9fa5d28b6057859e86fdc23ad62b31522deda80f8094' 
  AND token = 'GdOs62SufZrpzTW0BvWgTHD0Ur2liZhFmUxUcoOSg0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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