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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a9baecbc123bc3c9f9e6de3e5cb0d2d36afc702301671d95a7a88bfc8c41c23' 
  AND token = 'sUZQxL061Lqwf+8loPs4jzZtQTNqmGPjcye/ZEfh3f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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