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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47bde1ac08005737245db18fe1a46a89693eb55ff90366ed0b423e190c525a4c' 
  AND token = '86tM4CQGpB7O60mlxvUR9jT+WL+1+JdSZ+taKRTPZ6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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