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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a01dae2259f32cf1f7aaf0bbe856717ec305f58f9bb37518672e0f45febbbf0e' 
  AND token = 'Ul5ytKa7u5gV5e7/JGivXtD3SZOQsrYfEMO6liqj3hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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