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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bf71c9ac7d9078ebb1b498111c99547c112c1604ea012b1dfc37fa598bb650f' 
  AND token = '7jEDF3PmPo0wlwPDMlg3Ag0txtbn8Gt/FnAW+8D5Dpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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