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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c91680fa15dcfb368a9a58c515392fcabdc78ccb5435c6eb372ae6af3335ff27' 
  AND token = '3lm2uYOaA9NSgDdHkLWdCH3Q9Lw8/tOrdrsVeyFcDbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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