Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e31725cb789731feffe6f487d0adce7cab25114118e09667d22f072981cb6ce' 
  AND token = 'ofrr/Ybs2kznHdujs2v0fhNtnnT3TKHTbKtbfOBHcJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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