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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ece1cfa4b958e55979eeb4ddfc9e4def3914467c3dafa723baa12a284543d4c' 
  AND token = 'qP1sv3MhwHK5QjBJy50tnrJl9uSc5r5VGU9plLq6Nio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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