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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36aa085c38c2b93c7f87a61fe3659cd36aaa7480c397dff51dcbd2f44b6ffeeb' 
  AND token = 'BjGz37W9odC1vEbEHkILl+JXx5OEnr29uXJeR4DMG6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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