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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a95bb7439e823e82b41c593ea78310ae04f69116434663c1f2c089a60ce2ddc3' 
  AND token = '6lv05kO6LGf71Za5LAzi70Ym2Vg76gJ5tmWyKeZE/Ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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