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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '829a3d546c00faebcdedc35ca1cd43be87b4d1d3f75f537273e81a06d70db517' 
  AND token = 'CsrW5rWPhNu7kkWuHUszaAf9URZNQEir/mYyFZgPxHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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