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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23ac441f025d029d6bb8a8d41d180cdb091ba7f58a2e119dca5a582eee8758a5' 
  AND token = 'PO8v57dAIXtr6uczaqvST+XLrUPGi3/U8WSqojraSTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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