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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c77e0f4f5695a8e840603706cc91efe0c254cd3fb971cc44db5909d004ac78d' 
  AND token = 'bqaJ+jdf715cFLWRCa4+nFxxQ2yQag25uLXoe6xvMoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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