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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0015dfe0476eb5e5010259aa0e7bd0e8b4f22cb1bf6c738831745e565d5543af' 
  AND token = 'c9dri4/MzAq/YApENvqtzeheKnvW0MwhuSpDrYXztmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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