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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34b62850d7d184bd8f032fdd62b940856e119c6a0be3b075b163b39353dd6d8b' 
  AND token = '3+76tq/99dMcnSWjc4rE+M66PPXu/dOQTRb4W0XvtOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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