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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '306c733c43ae31390ea9e572b340c6560c3ee0c770b809540d39b9662768d5f7' 
  AND token = 'K9ilHgdMYMMH6lJyFRTii7ayN487Y+rojtJgxfHVplw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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