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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6f777d9a91c540dc92a6d4c94c6b005ec0010e1fcc38111ca84d83a0d794000' 
  AND token = '6NnvrvI7wTV6at/+rc7G/e7JZvcRcc9TXLYUhrdRUGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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