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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81228a5189ff58afb40ef896410ad5872c573a9ef7f783066acc7135652325b4' 
  AND token = 'YnbuMmzeH08FBRFTR8S2ORcJXMoFafzw6by0uJ9sD4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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