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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e59b3aefe08c4ddd35c952df90ed3f13a4f1f7424e726b02bb17d4bc4cbdbec' 
  AND token = 'sqLxhWIDtWJ42tHtUX5ALz8logJK+7wVGiydS62Co8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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