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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab9ea2d0caebbdfb4b536bdbc08a859f2d3f74a356dd099c72a33c37d0634629' 
  AND token = '9+bZSLDDp1UtskrCBtjVWVDtOFWX2CzIejmbFv+O3bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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