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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13d5beafdce443acc76b991ff3146e907751dcfad468a2321b69058a28ae8228' 
  AND token = 'QA2t2r3jcfRSl78sfcz9Padkxfy+w1lTVBZeBCKusCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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