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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ff8bbe7ea2f577dba1aeabc704e65ff51cd42e3ce84a3d3522d42cf626591c8' 
  AND token = 'E0WlHobLzfHc78rsNf5UX4Qj3kMq4P6W5jX+ADOVggw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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