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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b2da884faedbf1fe49e2f6b278abd2d42eb7017f239e4d9e8345ea3ec099f42' 
  AND token = '/SY1TiFqHlWb5iGre1WXPD67DRF5NXH61knZTwb3jyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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