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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56d7c1acd5ee280b3592f558a9c4275af84668494a15b0d54740f5ec7dcc9646' 
  AND token = 'Etb4l+U9uOA+vJJCUzgIIxN8SWHOeiflVY0BMq5Q7tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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