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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51fdfca2c77703d12eddd45c59c31f6e8093e74b0ed21935b7e563b92537e040' 
  AND token = 'TvQqWqUTMWvAu4xNx2WTTGxnKn6lxrOnjyLmZjriKjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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