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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ab7c734c049adfcfbfd5ddf80fe2ab5a2a648ff75e208f8bb1607525e7e9ecf' 
  AND token = 'I8EpuDYwqFLMIQrIHUO6UZRc7WqMR14KxBEy/e5yHI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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