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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df0c0d33595c5d9d7ea476775573f010954574131767632de94bd736a1b34360' 
  AND token = 'QTyhuYyuHnDawpXYOkrXYfEhnR9WgWdWj6d/VkuKozY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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