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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fa4989a43f685c49ec52af4ba2002f9b45c65bf8804d29a7908e993b4e30017' 
  AND token = 'iZBl2rbFkuJ+3L2u9U9Sl2Om1Mf1PPMY5E5cUGgAVsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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