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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3b6c88aacb50e4e39c9de53d5a5a2dcaef89d05d7d2632a5416696960f2a073' 
  AND token = 'IIk87kow0CRoadknskkB4DGciqbXdfnyBKItt6Oqmfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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