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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '733c9687956d46b84f49802406305cd1ea270d238e546e7543478c7821a77506' 
  AND token = '1uiGeykAf5M0QuPfmASGNKswW5USVA9yiDWCubnIr/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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