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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '951acac4fc056b08eb370fc0d480f652459520bd6d401308b05da0e9f2ee8124' 
  AND token = 'ZtUp38pNgBZuXQw3hd8Yww57CdgJRkX/+5bb/gSBgPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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