SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32c38830839992aaed64215119f53c9e6fc5881b05b6c073a14ca9a4a4f94110' 
  AND token = 'b4LekOVxlv6GcNp6+HK5CJcbQ7vwuVksmRP7tGZPGdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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