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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72f41680ef04d15f0831cfd3dfaa573476619a144e4aaed33f3ec2cae730009d' 
  AND token = 'UBKhgePg7oER32yl7e/mZvViqXfsJ5LaBynOZ+OD48M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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