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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd7f1410df39da81156aa9c6fc4bc90b0001eef33049c91a528f7497f0f3deb4' 
  AND token = 'y/nhfG5OV+9zASrJ8+Ljlg4apbBv9aGajGWWI5i6pPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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