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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '730edb1d119d87c11829924f3826ad9c40a6e7e5e709c45be4d7af287cb32346' 
  AND token = 'TQa0RQJ+DPh8PqIeyOaTjdK0LV+3huXdLzZQsjnjuts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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