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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb8883d6324601e43c8732e83b9b275a912a68d507c2ef8c9667ac7b7b29de50' 
  AND token = 'gS1YOzjySTu7BS8u209nGUsLvfUvz59eNHAIarugjWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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