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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '934d6765fd1f44ec4c9158de8ee28570c3c1a7eae7e5d3cbb31dde66767cc09d' 
  AND token = 'qiT61yNAnY0WYMbc6hH5RJUvvGrjiU1ZdXgSyf7XEmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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