Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6618ad318b29992f770edb1dacbf9dea6bdbc0c0db96e6e75f605b3de72666ce' 
  AND token = 'Cm+Mt+JkoQwM/oG5NsWwDQYiBdGx1uGDB7fwSOAFZPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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