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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35a9fc62eeaf96d292a699b7abe7ac1cec2000daef06dd1b0503849a4f1d3988' 
  AND token = '9IfGLw6j9V3MLx/C7WC4Z7iXQ4c4KBHmhd83MATvNOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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